Okay, I want more water pressure. I bought two separate under-the-
sink water filters. Not a dual unit, but two self contained water
filter units. Now I want to hook them up so that water flows
separately through each, then joins back together again before exiting
the kitchen faucet.

The unit is housed with 3/8" FPT (plastic) holding a 3/8MPT to 1/4
compression male (plastic). Do I have to step it down to 1/4 or can I
use the 3/8" FPT? I'm wondering if putting too much pressure on the
unit (by not bottlenecking it to 1/4"C) will cause it to function
improperly. I don't care about the pressure in this regard. I'm
getting the increase by using two units instead of the usual one.
However, I do want to use less fittings.

What about exiting the units? If 1/4 C is the intake then that's the
bottleneck, so at that point it shouldn't matter if I use 1/4"C or
3/8" FPT, right?


The faucet I have in mind is a single handle with standard 1/2 MPT.

Anyone know if the units themselves automatically act as a back flow
preventer? If not I'd be worried unequal pressure might blow water
back and forth from filtered to unfiltered water, not that I can see
any terrible consequences.

advice or criticism welcomed
thanks